References
 

Brock, Jim P., and Kenn Kaufmann. 2003. Butterflies of North America.  Kaufman Focus Guides. Boston: Houghton Mifflin.


Hammond, Paul C., and David McCorkle. 1983. The decline and extinction of Speyeria populations     resulting from human environmental disturbances. Journal of research on the Lepidoptera 22(4):    217-224.


Garth, J.S. and J.W. Tilden. 1986. California Butterflies. University of California Press.


Howe, W. H. 1975. Butterflies of North America. Doubleday and Co., Garden City, NY.


Orsak, L.J. 1974. Project Atossa - preliminary report. Atala 2:5-8.


WildEarth Guardians. 2010. Petition to list the Unsilvered Fritillary (Speyeria adiaste) under the U.S. endangered species act.